>> reporter: joe biden was in the buckeye state. >> ohio is going to pick the next president of the united states of america. >> reporter: if the democrats do win here, is that really it? >> everyone always says, no republican has been elected president without ohio. and that's absolutely true. but you know, every four years we break rules. >> reporter: the obama plans to take ohio, plus iowa and wisconsin, or new hampshire, or colorado, maybe virginia. >> the problem for the president, he has leads in these swing states by two, three points. the problem is, he's not over 50% in any of them. >> reporter: and 50-plus one is the winning number. so the pace will stay intense. governor romney tonight in iowa, president obama on the "tonight show" in l.a., then a late, late night rally in nevada, then an air force one red-eye to tampa to start tomorrow's swing state push in florida. i'm steve handelsman, news4.